KR-20260067056-A - ELECTRODE INK FOR WATER ELECTROLYSIS, ELECTRODE COMPRISING THE SAME AND MEMBRANE ELECTRODE ASSEMBLY FOR WATER ELECTROLYSIS

Abstract

The water electrolysis electrode ink of the present invention comprises a metal-supported catalyst; carbon nanotubes; and an ionomer; and comprises 0.01 to 3 weight% of carbon nanotubes (based on solid content).

Inventors

• 노치우
• 박정훈
• 채규식
• 이정행

Assignees

• 한화솔루션 주식회사

Dates

Publication Date

20260512

Application Date

20241105

Claims (10)

1. Metal-supported catalyst; Carbon nanotubes; and Ionomer; It is an electrode ink containing, The above electrode ink is a water electrolysis electrode ink containing 0.01 to 3 weight% (based on solid content) of carbon nanotubes.
2. In paragraph 1, The above metal-supported catalyst is a catalyst in which a metal is supported on a carbon support, and A water electrolysis electrode ink comprising one or more metals selected from platinum (Pt), palladium (Pd), ruthenium (Ru), iridium (Ir), rhodium (Rh), gold (Au), silver (Ag), nickel (Ni), copper (Cu), iron (Fe), cobalt (Co), chromium (Cr), manganese (Mn), molybdenum (Mo), yttrium (Y), and combinations thereof.
3. In paragraph 2, The above carbon carrier is spherical, and the water electrolysis electrode ink.
4. In paragraph 1, The above carbon nanotubes are a water electrolysis electrode ink having an aspect ratio (length/diameter) of 100 or more.
5. In paragraph 1, The above electrode ink comprises 100 parts by weight of a metal-supported catalyst, 0.01 to 3 parts by weight of carbon nanotubes; and 5 to 100 parts by weight of an ionomer, for water electrolysis electrode ink.
6. In paragraph 1, The above electrode ink is a water electrolysis electrode ink having a viscosity of 50 cPs to 10,000 cPs at 25°C.
7. A water electrolysis electrode comprising the water electrolysis electrode ink of any one of claims 1 to 6.
8. In paragraph 8, The above electrode is a water electrolysis electrode having an electrical conductivity of 1 to 10 S/cm2 as measured by a 4-point probe device.
9. Electrolyte membrane; and Includes an electrode layer formed on the surface of the above electrolyte membrane; A membrane electrode assembly for water electrolysis, wherein the electrode layer is formed from the water electrolysis electrode ink of any one of claims 1 to 6.
10. In claim 9, the electrode layer is a membrane electrode assembly for water electrolysis having a haze of 95% to 100%.

Description

Electrolytic electrode ink, electrolytic electrode comprising the same, and membrane electrode assembly for water electrolysis {ELECTRODE INK FOR WATER ELECTROLYSIS, ELECTRODE COMPRISING THE SAME AND MEMBRANE ELECTRODE ASSEMBLY FOR WATER ELECTROLYSIS} The present invention relates to a water electrolysis electrode ink, a water electrolysis electrode containing the same, and a membrane electrode assembly for water electrolysis. More specifically, the present invention relates to a water electrolysis electrode ink having excellent electrical conductivity, anion exchange membrane water electrolysis performance and durability, and improved coating properties and surface characteristics, a water electrolysis electrode containing the same, and a membrane electrode assembly for water electrolysis. In the current climate where the development of eco-friendly fuels is a major topic, water electrolysis is the only commercially available technology capable of producing the most perfectly green hydrogen. Water electrolysis technology is divided into three types: Proton Exchange Membrane Electrolysis Cell (PEMEC), Alkaline Electrolysis Cell (AEC), and Solid Oxide Electrolysis Cell (SOEC). As AEC has a history spanning over 100 years, it is a mature field in both market and technology; consequently, it is difficult to expect significant reductions in equipment production and operating costs through technological development. Furthermore, due to the low hydrogen production density of AEC, producing large volumes of hydrogen inevitably requires scaling up production and consequently increasing the size of equipment, making it difficult to ensure economic viability. PEMEC is a relatively recently commercialized technology that can directly produce high-purity, high-pressure hydrogen in compact facilities, and offers significant potential for reducing production and operating costs through technological development. However, as this is a recently commercialized technology, long-term operating data has not been secured, making it difficult to guarantee stability. Furthermore, the cost and processing expenses of the separator (or bipolar plate) materials, which are inevitably required under acidic operating conditions, account for a significant portion of production costs and can act as a burden. SOEC has the unique advantage of being usable as either an electrolyzer or a fuel cell with the same configuration, depending on the operating method. However, there are limitations: the solid oxide catalyst is susceptible to physical shock, limiting its stable application to stationary facilities; and the extremely high temperature of the water used in the process necessitates installation near sites where ultra-high temperature water is generated, such as steel mills or nuclear power plants. Accordingly, anion exchange membrane electrolysis (AEMEC) is being proposed as an alternative to solve the problems of existing water electrolysis methods. AEMEC has the advantage of enabling high-density hydrogen production similar to the hydrogen production density of PEMEC, resulting in a small facility size, and low production costs because it utilizes AEC materials. Conventionally, catalysts primarily used in water electrolysis electrode layers consisted of metals supported on spherical carbon supports. However, such catalysts suffer from poor electrical conductivity due to high interfacial resistance between the materials. Additionally, an increase in solid content during the ink manufacturing stage leads to coating film defects, while a decrease in solid content results in reduced coating performance due to low viscosity. Therefore, there is a need to develop an electrode ink that can reduce interfacial resistance during electrical conduction, improve the performance of AEMWE, has excellent coating properties without adding existing solid components, and has excellent surface characteristics and film strength of the coating film. Related prior art is KR 10-2018-0121004. Figure 1 shows the J-V performance curves of the membrane electrode assemblies prepared in Example 1 and Comparative Example 2. The present invention will be described in more detail below. Where terms such as 'comprising,' 'having,' and 'consisting of' are used in this specification, other parts may be added unless 'only' is used. Where a component is expressed in the singular, it includes cases where it includes the plural unless specifically stated otherwise. In interpreting the components, they are interpreted to include a margin of error even in the absence of a separate explicit statement. The water electrolysis electrode ink according to the present invention will be described in detail below. Water electrolysis electrode ink The water electrolysis electrode ink of the present invention comprises a metal-supported catalyst; carbon nanotubes; and an ionomer; and comprises 0.01 to 3 weight% of carbon nanotubes (based on solid content). (a) Metal-supported catalyst The